Safety-vent



(No Model.) Y I J. T. HAYDEN.

SAFETY VENT,

Patented Nov. 17 1896.

" NITED STATES PATENT OFFICE.

JAMES T. HAYDEN, OF OAK PARK, ILLINOIS, ASSIGNOR TO THE CRANE COMPANY, OF CHICAGO, ILLINOIS.

SAFETY-VENT.

SPECIFICATION forming part of Letters Patent No. 571,476, dated November 1'7, 1896. Application filed May 8, 1896. Serial No. 590,767. (No model.)

To all whom it may concern: uniform results could be secured. To accom-v Be it known that I, JAMES T. HAYDEN, a plish this, instead of making my disk flat and citizen of the United States, residing at Oak weakening it by a groove or channel turned Park, Cook county, State of Illinois, have inin its face near its edge I constructed it with 5 vented certain new and useful Improvements an offset, so arranged that the part adapted in Safety-Vents, of which the following, taken to be ruptured should be approximately oyin connection withthe accompanying drawlindrical in shape, and with disks made in ings, is a specification. this way I have found the variation in range My invention relates to that class of deof point of rupture does not exceed one hun- [O vices which are used, to provide against undred pounds except in exceptional cases, and

safe excess of pressurein fluid-pressure storin most instances it is not as much as that. age-receptacles. Before proceeding to specifically point out More specifically my invention belongs to my invention in the claims I will now dethat class of safety-vents which employadisk scribe it more in detail, reference being had I 5 which is adapted to be ruptured by the accuto the accompanying drawings, in which mulation of pressure above the determined Figure l is a plan view of a safety-vent maximum of safety. containing my improved disk. Fig. 2 is a I am aware that it is not new to provide a vertical section on the line 2 2 of Fig. 1. casing having a remo 'able disk or rupture- Asa matter of convenience in removing 20 plate, and I am aiso awarvthata eenstruc 'and renewing the disk when it has been ruption has been proposed in which the casing 'tured I prefer to form my vent in separable and rupture-plate are made in one piece. My parts, but this is not a part of my invention invention is in the nature of an improvement and not essential thereto, for, as previously in the rupture-disk itself, and is applicable intimated, my form of disk can also be used 2 5 to either of the two forms mentioned. It has in a vent formed all in one piece, it that be been found in practice'that'iiifall rupturedesired. disks heretofore used the range of variation The body of the vent 1 is threaded around in the bursting-points has been excessively its outer circumference to permit the screwand unsafely great. By careful experiment ing on of the ring 2, which holds the disk 3 q 0 made with a large number of disks I have in place. Between the disk 3 and body 1 is found that while some will burst at three provided a packing-ring or gasket 4 to prohundred pounds others will not give way unvide against leakage. til a pressure of seven hundred or in some The disk 3 is made with a center plate or rare cases eight hundred pounds has accuportion 5, an offset flange 6, and a substan- 8g 3 5 niulated, although all were calculated to vent tially cylindrical portion 7, which latter is the pressure at about four hundred pounds the part designed to be ruptured. to four hundred and fifty pounds. The disksl On the ring 2 are lugs 8, provided for the used in the experiments referred to were, as; purpose of permitting the use of a flat bar, as is customary, weakened at some point; by a wrench, to unscrew the ring when a new 0 0 being turned down to a predetermined tln'ckdisk is to be put in place. In the lower porness, and a careful examination of the parts tion of the body 1 is a screw-threaded openafter rupture failed to reveal any such varia ing 9, into which is to be attached the pipe tion in thickness as would warrant such radiwhich leads from the fluid-pressure storagecal differences in the range of bursting presreceptacle. 45 sures. Differences in grain and quality of Having thus described my invention, what the various metals used must then have been I claim as new, and desire to secure by Letters the main cause of the variations, and as this Patent, is-- was something very difficult to overcome it 1. In a safety-vent, a rupture-disk, comoccurred to me that by changing the nature prising a body portion a flanged offset, and 50 of the rupture fromakind ofashearing break a cylindrical portion, substantially as de to a director tensile pull on the metal more scribed.

2. In a safety-vent, a rupture-disk composed of a flat portion 5, an offset flange 4, and a cylindrical part '7, substantially as described.

5 3. I11 a safety-vent, a rupture-disk, comprising a body portion, an annular securing edge, and a cylindrical portion, substantially as described.

4:. In a safety-Vent, a rupture'disk, com- IO prising a body portion, a flanged portion and a weakened cylindrical portion, substantially as shown and described.

5. In a safety-vent, a rupture-disk, comprising a body portion, a securing portion, and a weakened portion approximately cy- I5 lindrical in shape, substantially as described.

JAMES T. HAYDEN.

Witnesses:

JOHN CONWAY, ROBERT GANFoRD. 

